if your minifig has 2 weapons he may use them both in one turn.
if two weapons hit the same target add the damage they do together.
A character can triple wield if the minifig can hold three weapons (ect multi armed minifig)

6.Only a hand weapon can be paired with another weapon, a heavy weapon can be paired with a shield only, a two handed weapon can not be paired unless you are jousting then you can pair it with a shield.